LYT2003D-TL Equivalent & Substitute Parts

Part Overview

The LYT2003D-TL is an offline switch flyback converter IC manufactured by Power Integrations, part of the LYTSwitch™-2 series. This isolated power management IC operates at 85kHz switching frequency with a 725V breakdown voltage rating and delivers 7W output power in an 8-SOIC package. The device is designed for offline flyback topology applications requiring integrated switching functionality.

The LYT2003D-TL maintains active product status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching functional topology, isolation characteristics, package compatibility, and operating parameter ranges suitable for equivalent circuit implementations.

Substiute Parts

LYT2003D-TL

Power IntegrationsIn Stock: 759LYT2003D-TL Datasheet

Current PartRFQ

RT7310GE

Richtek USA Inc.In Stock: 35468RT7310GE Datasheet

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TPS92075DDC/NOPB

Texas InstrumentsIn Stock: 1840TPS92075DDC/NOPB Datasheet

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TPS92310DGS/NOPB

Texas InstrumentsIn Stock: 1277TPS92310DGS/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LYT2003D-TL are identified based on the following substitution criteria:

Primary Matching Parameters:

• Topology classification: Flyback or compatible AC/DC offline switcher topology
• Output isolation: Isolated power conversion
• Switching frequency range: 60kHz to 150kHz (encompasses the 85kHz base frequency)
• Power delivery capability: Minimum 7W or equivalent output capacity
• Operating temperature range: Minimum -40°C lower bound with upper bound at or above 85°C
• Surface mount packaging: Compatible with PCB assembly processes
• Compliance status: Active product status with RoHS compliance

Substitution Logic: The LYT2003D-TL functions as an offline flyback converter with integrated switching. Substitute parts must operate in AC/DC offline switcher topologies with flyback or compatible buck/boost configurations. Internal switch presence is not a limiting factor for substitution, as external switching can be implemented. Package form factor differs among substitutes but all maintain surface mount compatibility. Voltage supply ranges and frequency specifications must overlap with or exceed the operational envelope of the main part.

Parameter Comparison

Engineering Selection Recommendations

RT7310GE (Richtek USA Inc.): The RT7310GE operates as an AC/DC offline switcher with flyback, buck, and boost topology support. This device is suitable for applications requiring multi-topology flexibility. The supply voltage range (12V to 25V) and operating temperature range (-40°C to 85°C) differ from the main part. MSL rating of 3 indicates moisture sensitivity requiring controlled storage conditions. All parts maintain active product status and RoHS compliance.

TPS92075DDC/NOPB (Texas Instruments): The TPS92075DDC/NOPB is an AC/DC offline switcher with buck and boost topology. Supply voltage range spans 11V to 18V. Operating temperature range extends to 125°C (TJ), exceeding the main part's lower temperature specification. MSL rating of 1 matches the main part. Package form factor is SOT-23-6 Thin. This device is designated for lighting applications.

TPS92310DGS/NOPB (Texas Instruments): The TPS92310DGS/NOPB operates as an AC/DC offline switcher with flyback topology, matching the main part's topology classification. Switching frequency range of 60kHz to 150kHz encompasses the 85kHz specification. Supply voltage range is 13V to 36V. Operating temperature range reaches 125°C (TJ). MSL rating of 1 and RoHS compliance align with the main part. Package is 10-TFSOP/10-MSOP.

All substitute parts maintain active product status, RoHS compliance, and REACH unaffected status. Selection depends on specific application requirements including topology flexibility, voltage supply constraints, temperature operating envelope, and package footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the RT7310GE directly replace the LYT2003D-TL in all applications?

A: The RT7310GE supports flyback topology but also includes buck and boost configurations. The supply voltage range (12V to 25V) and maximum operating temperature (85°C TA) differ from the LYT2003D-TL. Package form factor is SOT-23-6 versus 8-SOIC. Application-specific validation is required for direct substitution.

Q: What is the significance of the MSL rating difference between substitute parts?

A: The LYT2003D-TL and TPS92075DDC/NOPB both carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The RT7310GE carries MSL 3 (168 Hours), requiring controlled storage and handling within 168 hours of package opening. MSL 3 components require desiccant storage and may require baking before reflow soldering.

Q: How do the switching frequency specifications affect substitution?

A: The LYT2003D-TL operates at 85kHz fixed frequency. The TPS92310DGS/NOPB supports 60kHz to 150kHz range, encompassing the 85kHz specification. The RT7310GE and TPS92075DDC/NOPB do not specify switching frequency, indicating application-dependent or programmable operation. Frequency matching affects EMI characteristics and transformer design.

Q: Are all substitute parts suitable for isolated power conversion applications?

A: The LYT2003D-TL explicitly provides isolated output. The substitute parts operate as AC/DC offline switchers but do not specify isolation characteristics in the provided parameters. Application circuits must be evaluated to determine isolation requirements and implementation methods.

Q: What package considerations apply when selecting a substitute?

A: The LYT2003D-TL uses 8-SOIC (0.154", 3.90mm Width) with 7 leads. Substitutes use SOT-23-6 (RT7310GE, TPS92075DDC/NOPB) or 10-TFSOP/10-MSOP (TPS92310DGS/NOPB). Different package footprints require PCB redesign. Pin count and lead spacing differ significantly, necessitating schematic and layout modifications.

Q: Which substitute part has the widest operating temperature range?

A: The TPS92075DDC/NOPB and TPS92310DGS/NOPB both specify -40°C to 125°C (TJ), exceeding the LYT2003D-TL's upper limit of 150°C (TJ). The RT7310GE specifies -40°C to 85°C (TA), the most restrictive upper limit. Temperature range selection depends on application thermal environment requirements.

Q: Do all substitute parts maintain the same compliance certifications?

A: All parts are RoHS compliant and REACH unaffected. The LYT2003D-TL is RoHS Compliant; substitutes are ROHS3 Compliant. All parts carry ECCN EAR99 and HTSUS 8542.39.0001 classifications. Compliance status is equivalent across all options.